When you ask "What number is halfway between 86 and 171?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=86 and Y=171.
To find the number halfway between 86 and 171, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 171 into our formula, we get:
(86 + 171)/2 = 128.5
Thus, the number halfway between 86 and 171 is 128.5.
To check that our answer is correct, we subtract 86 from 128.5 and subtract 128.5 from 171 and compare the two numbers:
128.5 - 86 = 42.5
171 - 128.5 = 42.5
As you can see, the halfway number is 42.5 higher than 86 and 42.5 lower than 171. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 86 and 172
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